Rock drill



June 11, 1940. uc -r 2,203,954

' RQCK DRILL Filed 001;. 21., 1938 ALBERT FEUCHT f ATTORNEY Patented June ll, 1940;

ROCK DRILL Albert Feucht, Garfield Heights, Ohio assignor to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporation of Ohio Application October 21, 1938, Serial No. 236,221

7 Claims.

This invention relates broadly to fluid actuated rock drills of the drifter typeequippedwith an automatic feed, but more particularly to remote controls operable for governing the direction of feeding motion of the rock arm and the operation thereof.

Rock drills of the drifter typegenerally include a fluid actuated drilling motor provided with guides for slidable movement on a supporter 1d shell. Hand operated feeding devices through which slidable or feeding movement is imparted to the rock drill relative to its support, are today gradually replaced by what is generally termed automatic feeding mechanism. In practice, auto- 1| matic feeding mechanisms are usually of the jump feed type where in actuation of the mechanism depends upon the vibration. imparted thereto by the drilling motor, or of the power feed type, wherein the actuation of the mecha:

go nism depends upon the action of the motive fluid,

such as compressed air, admitted therein.

The. types of feeding mechanism above re ferred to are further divided into two distinct types generally known as stationary when carg ried by the support, and movable when carby the operator. On the other hand, the throttle valve operable for controlling the admission of the motive fluid is located within the back head 6 of the drilling motor, and therefore movable back and'forth with the. drilling motor. In practice, this stationary type of feeding mechanism has been found objectionable not only because of the position of the throttle relative to that of 4,5 the feed control, but also due to the additional weight on the rear end of the shell tending to amplify the extent of the vibrations transmitted thereto from the drilling motor, thereby requir-f I ing the use of a stronger and consequently heavier 50 shell.

In the movable type of feeding mechanism, the feed motor-housing is generally carried by the back head of the drilling motor and consequently moves backand forth with the drilling motor,

"5 thereby overcoming the objection encountered with thestationary. type due to the additional weight carried by the rear end of the shell. In

this instance, because of the throttle valve already located within the rear end or back head of the drilling motor, difficulty has been en- 5 countered to position the feed control where it would be readily accessible to the operator irrespective of the location of the drilling motor relative to the work. This type of movable feed control has also been found objectionable be- 10' cause, in order to operate the control, the operator had to follow the drilling motor back and forth, and in cases where it was located at certain angles or in confined areas, it was almost impossible for the operator to reach the feed con- 16 trol. i

It is therefore one object of this invention to produce a rock drillequipped with an automatic feeding mechanism carried by the rock drill for slidable movement therewith, but having a remote feed control located near the rear end of the shell at a place readily accessible by the operator.

Another object of this invention is to provide such a rock drill with feed and throttle valve struction and aggroupment of the elements peculiar to this structure as will become apparent from amore complete examination of this specification, in the claims of which there are assembled certain specific combinations of parts and specific construction indicative of the scope and spirit; of the invention. I

In the drawingwhich illustrates a preferred form of the invention:

Fig. 1 is a side elevational view ofa rock drill embodying the invention shown partly in section to illustrate detailsof construction.

Fig. 2 is an enlarged cross sectional view taken in a plane indicated by the line 2--2 in Fig. 1.

Fig. 3 is an end elevational view looking in the direction of the arrows 3--3 in Fig. 1.

Referring to the drawing, I0 represents a fluid actuated rock drill or drilling motor of the drifter type having guides ll slidable Within corresponding gu'ideways l2 of a guide shell or support It, which support is provided with the usual cone l4 depending therefrom.

, Securedto the rear end of the drilling motor ID by a pair of through bolts I5 one of which is 3 side wall thereof by one or more icap screws 20.

Since the feeding mechanism does not form a part of this invention, no further description of the same is thought necessary other than pointing out that the feeding mechanism may-be either fluid actuated or depend for its operation upon the jars or vibration resulting from, the

reversal of the piston stroke within, the drilling motor I0, which feeding mechanisms. always include a feed control manually operated for se-j lectively controlling the direction of the feeding motion. For the purpose of illustrationther'e is shown a feed control 2| rotatable within a substantially rectangular body portion 22 depending from the housing 16 and extending into the shell It. The control 21 is formed at one end with a gear '23 meshing with a gear 24 journaled within lugs 25 and 26 depending from the boss 22 and head ll respectively. The gear 24 is mounted betweenthe lugs 25 and 26.,against longitudinal movement relative thereto, and is formed with a square bore 27 extending centrally therethrough, While the lug ZEis provided with a cylindrical bore 23 enabling free rotation of a square rod 29 extending longitudinally of the shell 3 through the gear 23 and lug 25. The ends of this rod are turned down smooth with the front end 30 thereof journaled within the front end of the shell I3, while the rear end 3! is journaled within a bushing 32 carried by the rear end of the shell, and extends therethrough to receive a handle 33 secured thereon against rotation by a key 3 and a nut 35. The rod 29 is of a'size calculated to enable free slidable movement of the gear 23 thereon, and prevent, due to the polygonal cross section of the gear-bore 21 and rod 29, relative rotation therebetween.

Within the body portion 22, there is also a throttle valve 36 rotatable therein for controlling the admissionof the motive fluid to the drilling motor. This throttle valve is also equipped with a gear 31 secured thereon by .a'key 38 and meshing with a gear 39'journaled within lugs similar to the lugs 25 and 26. The gear 39 is also formed with a square bore 40 having a square rod 4-! extending therethrough with its ends journaled within the corresponding ends of, the shell I3 similarly to the ends of the rod 29. To the rear end of the rod M is also secured a handle 42 locked thereon by a nut 43, and located exteriorly of the shell. beside the handle 33.

To prevent accidental rotation of the feed control 2i and throttle valve 38, the hubs of gears 23 and 31 have been provided with a series of detents 46 adapted to receive the free end of spring pressed plungers 45 and 46 respectively,

5 Which are slidably mounted within the housing and the gear 23. With the handle 33 positioned as shown in Fig. 3, the feed control 2| will assume a position effecting the rearward feeding motion of the drilling motor l0. When the handle is rotated into the .three oclock position, the corresponding position of the feed control 2| will prevent any feeding motion of the drilling motor, and when the handle is rotated into a twelve oclock position, the feed control 21 will assume a position causing forward feeding motion of the drilling motor ll].

With reference to the throttle valve 36, it will also be understood that its rotation for controlling the admission of the motive fluid into the drilling motor 10 may be effected by rotating the handle 42, thereby resulting in the rotation of 'the rod M, the gear 39 and the gear 31 which is Although the foregoing description is necessarily of a detailed character, in order to completely setforth. the invention, it is tobe understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. The combination with asupport having a drill slidable thereon, of a feeding mechanism for the drill capable of imparting feeding motion thereto in two directions, of a feed direction control carried by the drill for movement therewith movablefor selectively controlling the direction of feed imparted to the drill, and means carried by the support operatively associated with said control and operable from one endof said support for effecting movement of said control irrespective of its position relative to the support.

2. The combination with a support having 'a drill slidable thereon, of, a feeding mechanism for the drill capable of imparting feeding motion thereto in two directions, of a feed direction control carried by the drill for movement therewith and movable relative thereto for selectively controlling the direction of feed imparted to the drill, a manually movable handle carried by the support near one end thereof, and movement transmitting means between said handle and control operative irrespective of the position of said controlrelative to-the support. 1

3. The combination with a support having a drill slidable thereon, of a feeding mechanism for the drill. capable of imparting feeding motion thereto, of a feed control for said mecha nism carried by the drill for slidable movement therewith, said control being movable into feeding mechanism operative and inoperative position, and a rod extending longitudinally of the support operatively associated with said control, said rod being selectively movable for shifting said control into either of'the positions aforesaid.

4. The combination with a support having a fluid actuated drilling motor slidable thereon, of a throttle valve rotatably carried by the motor for controlling admission of the motive fluid therein, a rotatable handle carried by the support near one end thereof, and rotation transmitting means between said handle and throttle valve operative irrespective of the position of the motor on the support.

5. The combination with a support having a motor slidable thereon, a valve carried by the motor for slidable movement therewith, a mov able handle carried by the support, and means for transmitting movement from said handle to said valve.

6. The combination with a support having a motor slidable thereon, a rotatable valve carried by the motor for slidable movement therewith, a manually rotatable handle carried by the su port, and rotation transmitting means between said handle and valve.

7. The combination with a support having a drill slidable thereon, of a feeding mechanism for the drill including a feed motor secured to the drill for slida ble movement relative to the support, a motor control carriedby said motor, a

movable handle carried by the support, and

means for transmitting movement from said handle to saidcontrol;

a ALBERT FEUCHT. 

